Durable metal construction with high hardness and corrosion resistance for long service life in demanding environments. Excellent workmanship with a smooth burr-free surface on each split pin for easy insertion and reliable fastening. Includes 5 types of split pins, 35 pieces per type, for a total of 175 pieces. Practical industrial fastening hardware suitable for securing shafts, linkages, gears, hinges, and other assemblies that use split pins. The plastic storage box keeps pins organized by type, making it easy to find the exact pin you need quickly. 2-3 practical use scenarios - Machinery maintenance and assembly: replace worn or loose split pins in shafts, couplings, or lever assemblies to restore secure operation. - Equipment setup and repair in workshops or factories: have a variety of split pin sizes on hand to quickly secure components during assembly or maintenance tasks. - DIY projects and home repairs: use the different pin types for quick disassembly and reassembly of structural or mechanical projects.